What I need help with is nothing more than tweaking with gravity and jump strength and all that good stuff... I've been at it for two hours straight trying to get the physics work as close as I can to Super Mario World's, but it just isn't working out, even when playing the real game side by side for comparison. I have no excuses -- I'm just not that good at it.

If anyone happens to be 1) awesome at tweaking all of these values and 2) pretty familiar with the feel of Super Mario World, I'd be eternally grateful if you could take a look and see what I'm doing wrong.